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You cannot. It must be done by the admin.
What is the reason for deleting the account? Do you want to change the name (this can be done on an existing account)?
Typically it's best not to delete accounts entirely so that others can benefit from the questions you've asked. And if all of your posts are removed it creates a strange gap in discussions that is misleading and confusing.
If you would like the account disabled, that is possible, but I'm not sure what the advantage would be.